mandismoney
Jan 6, 2009, 08:06 AM
I have a Lennox G60UHV that was installed in Oct of 2005. It is a 2 stage variable, natural gas. We purchased an AC unit 2 yrs ago and it is outside (never a problem with the AC). We have a metal flue pipe so I'm assuming it's and 80+ efficiency.
A month ago on a windy day it started acting up. The furnace ran fine hit thermostat temp and shut down. Then when the call for heat came back on (after it cooled down in the house) it wouldn't turn on. We had to go to the back room and turn it off and back on. Then it would work again for a cycle or two and we'd have to do it again. This happened for a day or so then it worked fine again and we didn't have a problem for another week or so when it got really cold and windy. Same problem. Then a few days ago it started happening again and won't stop. I took the thermostat (Lennox Signature STat) off and replaced it (Lennox Comfort Sense Stat -- under warranty) and thought our problems were over. However last night while checking the new wiring we discovered as the furnace kicked the processes seemed normal....we got to the point where there were big blue flames were blowing and then the LED lights started flashing an error code "Primary, secondary or rollout limit switch open. Limits must close within 3 minutes or unit goes into 1 hour Watchguard"
We got online and read about poor airflow so we removed a screen on the outside of our filter and vacuumed the filter to see if this might be the problem. We turned the power off and back on and then the unit ran without error codes. This morning I woke up and it was only 65 degrees in our house. I upped the thermostat and the stat showed that it was heating but when I went to the furnace room the furnace wasn't running and the LED lights were showing a new code: "Watchguard -- burners failed to ignite; OR limit open more than 3 minutes; OR lost flame sense 5 times in one heating cycle; OR pressure switch opened 5 times in one heating cycle"
We have warranty on parts but not labor so any help is greatly appreciated!!
A month ago on a windy day it started acting up. The furnace ran fine hit thermostat temp and shut down. Then when the call for heat came back on (after it cooled down in the house) it wouldn't turn on. We had to go to the back room and turn it off and back on. Then it would work again for a cycle or two and we'd have to do it again. This happened for a day or so then it worked fine again and we didn't have a problem for another week or so when it got really cold and windy. Same problem. Then a few days ago it started happening again and won't stop. I took the thermostat (Lennox Signature STat) off and replaced it (Lennox Comfort Sense Stat -- under warranty) and thought our problems were over. However last night while checking the new wiring we discovered as the furnace kicked the processes seemed normal....we got to the point where there were big blue flames were blowing and then the LED lights started flashing an error code "Primary, secondary or rollout limit switch open. Limits must close within 3 minutes or unit goes into 1 hour Watchguard"
We got online and read about poor airflow so we removed a screen on the outside of our filter and vacuumed the filter to see if this might be the problem. We turned the power off and back on and then the unit ran without error codes. This morning I woke up and it was only 65 degrees in our house. I upped the thermostat and the stat showed that it was heating but when I went to the furnace room the furnace wasn't running and the LED lights were showing a new code: "Watchguard -- burners failed to ignite; OR limit open more than 3 minutes; OR lost flame sense 5 times in one heating cycle; OR pressure switch opened 5 times in one heating cycle"
We have warranty on parts but not labor so any help is greatly appreciated!!